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Table 4 Association of airway assessment tests with modified Cormack-Lehane grading with BURP

From: Evaluation of different airway tests to determine difficult intubation in apparently normal adult patients undergoing surgical procedures

 

Cormack-Lehane grading with BURP

P-Value

Grades 1 and 2A

(Easy, n = 145)

Grades 2B and 3

(Difficult, n = 15)

MMT with tongue protrusion

  

0.437

 Mallampati I and II

129

9

 Mallampati III and IV

16

6

MMT without tongue protrusion

  

0.536

 Mallampati I and II

113

6

 Mallampati III and IV

32

9

Mandibular protrusion test

  

<  0.001

 Grade A and B

138

8

 Grade C

7

7

Inter-incisor gap (cm)

4.61 ± 0.74

4.5 ± 0.68

0.569 t

Thyromental distance (cm)

7.19 ± 1.47

8.00 ± 1.47

0.021 t

Sternomental distance (cm)

24.00 ± 14.80

12.80 ± 2.80

0.007 t

  1. Data are presented as mean ± standard deviation, or number. BURP, backward, upward, and right-sided pressure on the thyroid and cricoid cartilages; MMT, modified Mallampati test; t, Student’s t-test